Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

Thread Closed
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

38-12 Oscillator Replacement
#19

Hope maybe I am not on the wrong track.  I substituted another "OS coil" pulled from a like kind chassis found on eBay.  Ohms on the coil looked good 3.5/6 ohms PN #32-3021.  Although not exact rr coil it responds just like the universal OS I tried .  My symptoms are as follows.  I get reception.  (Prior issue was no reception and open OS coil)  Reception is only from aprox 770KC to 1080KC all appearing higher on the dial.  EX  820 is showing around 1100.  Tried to adjust the Compensator 3B-3A  .  moved the signal a little but very little,  There is an adjustment on the underside of the tuning Condenser similar to the top 3B.  Slight change but not significant.  I have ohm the 51K resistor out of ckt and it measures 56K.  The 110 uf measures 160UF out of ckt.  Enclosed are my V measurements on the 6A&.  *I have also substituted the 6A7 and 78 tubes for trial.  Can't seem to understand why the frequencies are so far off .  IF adjustment has some slight up/down but nothing .  Lower frequency channels do nit register.  550KC to aprox 700.  


Attached Files Image(s)
   


Messages In This Thread
38-12 Oscillator Replacement - by Radioguy52 - 04-28-2022, 12:17 PM
RE: 38-12 Oscillator Replacement - by Radioguy52 - 04-28-2022, 03:41 PM
RE: 38-12 Oscillator Replacement - by Radioroslyn - 04-28-2022, 05:40 PM
RE: 38-12 Oscillator Replacement - by Radioguy52 - 04-28-2022, 06:11 PM
RE: 38-12 Oscillator Replacement - by Radioroslyn - 04-28-2022, 06:48 PM
RE: 38-12 Oscillator Replacement - by Radioguy52 - 04-28-2022, 10:19 PM
RE: 38-12 Oscillator Replacement - by Chas - 04-28-2022, 11:14 PM
RE: 38-12 Oscillator Replacement - by Radioroslyn - 04-29-2022, 10:53 AM
RE: 38-12 Oscillator Replacement - by Radioguy52 - 04-29-2022, 11:49 AM
RE: 38-12 Oscillator Replacement - by Radioguy52 - 04-29-2022, 11:52 AM
RE: 38-12 Oscillator Replacement - by Radioroslyn - 04-29-2022, 03:54 PM
RE: 38-12 Oscillator Replacement - by Radioguy52 - 04-29-2022, 04:46 PM
RE: 38-12 Oscillator Replacement - by Radioroslyn - 04-29-2022, 05:17 PM
RE: 38-12 Oscillator Replacement - by Radioroslyn - 04-29-2022, 05:28 PM
RE: 38-12 Oscillator Replacement - by BrendaAnnD - 04-30-2022, 03:11 AM
RE: 38-12 Oscillator Replacement - by Radioguy52 - 05-01-2022, 07:21 PM
RE: 38-12 Oscillator Replacement - by Mondial - 05-01-2022, 09:29 PM
RE: 38-12 Oscillator Replacement - by Radioguy52 - 05-01-2022, 11:02 PM
RE: 38-12 Oscillator Replacement - by Radioguy52 - 05-10-2022, 09:09 AM
RE: 38-12 Oscillator Replacement - by Chas - 05-10-2022, 10:42 AM
RE: 38-12 Oscillator Replacement - by Radioguy52 - 05-10-2022, 11:14 AM
RE: 38-12 Oscillator Replacement - by Radioguy52 - 05-10-2022, 12:07 PM
RE: 38-12 Oscillator Replacement - by David - 05-10-2022, 12:59 PM
RE: 38-12 Oscillator Replacement - by Radioguy52 - 05-10-2022, 03:38 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco 42-345 Restoration/Repair
Hi OSanders, Look carefully at the band switch. Turn it slowly and "wiggle" it around the desired band. ...MrFixr55 — 12:33 AM
5U4 vs 5Z4 tubes
I think that RCA and GE introduced metal tubes in the USA in 1936.  I don't know if they were being made by RCA, GE or b...MrFixr55 — 11:20 PM
Philco 42-345 Restoration/Repair
Vlad95, Thank you for the stringing guides and wow there are so manyosanders0311 — 06:01 PM
5U4 vs 5Z4 tubes
A pre war Hallicrafters, and an early one too, very nice! 1936 is pretty early for metal tubes too, which would explain ...Arran — 05:58 PM
Philco 42-345 Restoration/Repair
Thanks Rod, "When you hear the background hiss and no station it usually indicates that the oscillator quit" ...osanders0311 — 05:52 PM
Philco 42-345 Restoration/Repair
RodB :beerchug:Vlad95 — 10:22 AM
Philco 42-345 Restoration/Repair
Vlad, you nailed it. Swiss and German roots.RodB — 09:54 AM
5U4 vs 5Z4 tubes
Well this is a Hallicrafters SX/9 circa 1936. No real issues so far although I dodged a real bullet with a cap that was...bridkarl — 07:59 AM
5U4 vs 5Z4 tubes
The pinout is the same but the 5U4 has a 3 amp filament, verses 2 amps or less on the 5Z4. I think that the pinout of a ...Arran — 12:04 AM
Philco 42-345 Restoration/Repair
By the way. osanders0311 Take a look here: Dial cord stringing Guides May be here you can fount correct string settin...Vlad95 — 11:15 PM

[-]
Who's Online
There are currently 1103 online users. [Complete List]
» 1 Member(s) | 1102 Guest(s)
Avatar

>